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Finding the Fourth Proportional to 2,857, 4,280.78 and 2,617.88

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Solution

The fourth proportional to 2,857, 4,280.78 and 2,617.88 is: 3,922.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,857 : 4,280.78 = 2,617.88 : x
  2. Step 2: Convert to fraction form
    2,857/4,280.78 = 2,617.88/x
  3. Step 3: Cross multiply
    2,857x = 4,280.78 × 2,617.88
  4. Step 4: Simplify right side
    2,857x = 11,206,568.35
  5. Step 5: Solve for x
    x = 11,206,568.35/2,857
  6. Step 6: Final answer
    x = 3,922.50

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.